Nozzle Part, Connector, Nozzle Assembly, and Kit

ABSTRACT

A nozzle part for conveying a viscous fluid, comprising at least one wall defining a passageway, the passageway having an outlet remote from an inlet, the passageway having a larger cross sectional area at or adjacent its inlet compared to a lower cross sectional area at or adjacent its outlet, wherein at least a part of the wall is provided with at least one indicator to differentiate a part of the wall from the remainder of the wall.

This application claims priority to U.S. provisional application Ser. No. 61/803,947, filed on Mar. 21, 2013; this application also claims priority to U.K. patent application No. 1305215.4, filed on Mar. 21, 2013.

DESCRIPTION OF INVENTION

This invention relates to a nozzle part for conveying a viscous liquid. The invention is described in relation to a dispensing nozzle for dispensing viscous liquid from a storage tube thereof.

There are numerous fluids in the form of gels, viscous liquids, and flowable polymers commonly used today for a number of different purposes. For example, adhesives are used to bond surfaces together, a number of gels are used in the medical field, and caulking material is used in the building trade to seal areas where solid materials join, to make them air and/or watertight. All such substances are referred to herein as “viscous liquids”. It is common for these to be stored in a tube, and for them to be dispensed by increasing pressure upon the contents of the tube. For example, the tube walls may be compressed to decrease the internal volume of the entire tube, or a piston may be disposed at one end of the tube and may be displaced axially to decrease the internal volume of the tube available to the viscous liquid. Alternatively, a pneumatic applicator may be used, which forces air (or another propellant gas) into the storage volume of the tube to displace the viscous liquid from the tube, or to actuate a piston to do the same.

A storage tube has an outlet through which the contents of the tube are dispensed, and it is common for a nozzle to be attached to this outlet, to direct the substance in question. In the case of caulking, or other such sealants, nozzles of various shapes and sizes are used. The nozzle controls the cross-sectional shape and dimensions of the dispensed liquid, and the point at which the liquid is dispensed relative to the outlet, and it can also affect the shape of the material as it leaves the tube. The form which the viscous liquid takes when it leaves the nozzle is often referred to as a ‘bead’.

One such area where such sealant and nozzle arrangements are used is in the building trade, where sealants are used to seal construction panels and decorative panels within buildings. For example, in a building it is common for there to be sealant provided between a number of joints in the bathroom and kitchen, such as for sealing a sink unit to a kitchen surface, or sealing skirting boards or tiled surfaces at right angle joints. Such viscous liquids may also be used in difficult-to-access areas, such as sealing around pipes and taps within a kitchen or bathroom. Similarly, in the automotive industry, it may be desirable to dispense a viscous liquid, such as a grease, to a difficult-to-access part of a vehicle. As most prior art nozzles are fixed in one position, and extend in an axial direction from the tube, they are poorly adapted to allow a user to deliver the viscous liquid in question to difficult-to-access work areas.

A repositionable nozzle which seeks to overcome this problem has been proposed, comprising three main components—a base part which connects to a storage tube, an extender part which joins to the base part, and a dispensing part which connects to the extender part, and includes the nozzle outlet for dispensing the viscous liquid. Each part includes a passageway, and the parts connect to each other in a manner which allows fluid communication between their respective passageways, and hinders or prevents any viscous liquid from leaking at the point at which the parts join together.

The base part is adapted to connect to a storage tube at its lower end, and has a hollow frusto-spherical ball formation at its upper end. The extender part is provided with a part-spherical socket formation at its lower end, and a hollow frusto-spherical ball formation at its upper end, and the dispensing part has a part-spherical socket formation at its lower end and an opening at its upper end.

The part-spherical socket formation is dimensioned such that it engages the hollow frusto-spherical ball formation in an interference fit, and it may be a snap fit arrangement. Once engaged, the part-spherical socket can rotate about the frusto-spherical ball formation, allowing the parts to pivot relative to one another. The formations may be separated from one another after being fitted together, and can be reconnected if necessary, such that the parts can be used as a kit of parts for achieving various configurations as required. The parts can therefore be assembled to achieve a number of different lengths of nozzle, and the nozzle can be pivoted as required to achieve a great number of angles. The fitment of the parts to each other also resists the straightening effect of the viscous liquid passing through it, which allows the user to dispense the liquid to the desired area in a controllable manner.

There are several issues with the nozzle arrangement discussed above. As the opening of the nozzle is of a fixed cross-sectional area, each dispensing part can only be used to achieve a single bead thickness, which means that multiple dispensing parts must be made, to allow a range of bead thicknesses to be achieved.

However, having multiple dispensing parts is an undesirable solution, as these must then be carried by the end user, and also fitted to the nozzle. For a repositionable nozzle, the dispensing part must be relatively small to get into restricted spaces, and an end user is likely to find a small component difficult to handle and fit.

There are also issues associated with the base part of the nozzle. Different sized storage tubes have different sized outlets, so the base part of a nozzle is dimensioned to fit one particular size of storage tube outlet. For the reasons discussed above, the need for a number of different base parts also has an undesirable effect.

Embodiments of the present invention seek to ameliorate one or more problems associated with the prior art.

Accordingly, an aspect of the present invention provides a nozzle part for conveying a viscous fluid, comprising: at least one wall defining a passageway, the passageway having an outlet remote from an inlet, the passageway having a larger cross sectional area at or adjacent its inlet compared to a lower cross sectional area at or adjacent its outlet, wherein at least a part of the wall is provided with at least one indicator to differentiate a part of the wall from the remainder of the wall.

The indicator may comprise at least one of: a marking on a surface of the wall; a recess or groove in the wall; or an area of weakness in the wall.

The indicator may extend in a direction perpendicular to a longitudinal axis of the passageway.

The indicator may extend around the perimeter of the wall.

The indicator may be provided on an outer surface of the wall.

The indicator may be provided on an inner surface of the wall.

The at least one indicator may be a plurality of indicators disposed in order of weakness relative to the outlet.

The at least one indicator is a plurality of indicators which may be progressively resistant to breakage in a direction away from the outlet.

The indicator may be in the form of a step defining a corner.

The indicator may be in the form of an area of reduced wall thickness.

The nozzle may be provided with a socket formation at or adjacent its inlet.

The socket formation may be part-spherical.

Another aspect of the invention provides a connector for engagement with an outlet formation of a storage tube, comprising a first connector portion adapted to engage an outlet formation of a first configuration, and a second connector portion adapted to engage an outlet formation of a second configuration, the first and second connector portions being movable relative to one another to permit a selected one of them to engage an outlet formation of the respective first or second configuration.

The engagement formation of the second connector portion, adapted to engage an outlet formation of a second configuration, may be engageable with the first connector portion.

The engagement formation may be a screw thread.

The second connector portion may be of larger diameter than that of the first connector portion, and the first connector portion may lie at least partially within the second connector portion.

The engagement formation of the second connector portion may engage a screw thread and relative axial movement of first and second connector portions, to enable engagement with respective outlet formations, is effected by relative rotational movement of the first and second connector portions.

There may be a screw thread within the first connector portion.

The first connector portion may be provided with an engagement formation at or adjacent its outlet.

The engagement formation may comprise a hollow frusto-spherical formation.

Another aspect provides a nozzle part for conveying a viscous liquid from a storage tube, the nozzle part including a connection means for engagement with an outlet formation of the storage tube, comprising a first connector portion adapted to engage an outlet formation of a first configuration and a second connector portion adapted to engage an outlet formation of a second configuration, the first and second connector portions being movable relative to one another to permit a selected one to engage an outlet formation of the respective first or second configuration.

Another aspect provides a connector for engagement with a delivery nozzle of a storage tube, the connector comprising: a hollow outer shell; and a resiliently deformable inner sleeve fitted within the outer shell, wherein the resiliently deformable inner sleeve is configured to receive at least part of the delivery nozzle of the storage tube such that the resiliently deformable inner sleeve at least partially deforms to hold the delivery nozzle in engagement with the connector.

The hollow outer shell may define a passageway in which the resiliently deformable inner sleeve is received.

The connector may be configured such that an end of the delivery nozzle including an aperture is located beyond the confines of the resiliently deformable inner sleeve when the delivery nozzle is at least partially received by the resiliently deformable inner sleeve

The resiliently deformable inner sleeve may be supported by the hollow outer shell.

The connector may define a passageway for the flow of a viscous liquid from the delivery nozzle.

Another aspect provides a nozzle or nozzle assembly comprising a nozzle part as above and a connector part as above.

The nozzle part may be integral with the first connector portion.

Another aspect provides a kit of parts comprising a nozzle part as above and a connector part as above.

The kit of parts may further comprise an extender part.

Embodiments of the present invention are described, by way of example only, with reference to the accompanying drawings, in which:

FIG. 1 shows a nozzle part which incorporates aspects of an embodiment of the invention;

FIG. 2 shows a nozzle part which incorporates aspects of an embodiment of the invention;

FIG. 3 shows an alternative nozzle part which incorporates aspects of an embodiment of the invention;

FIG. 4 shows another alternative nozzle part which incorporates aspects of an embodiment of the invention;

FIG. 5 shows a further alternative nozzle part which incorporates aspects of an embodiment of the invention;

FIG. 6 shows a further nozzle part which incorporates aspects of an embodiment of the invention;

FIG. 7 shows another nozzle which incorporates several alternative forms of aspects of an embodiment of the invention;

FIG. 8 shows a connector part incorporating aspects of an embodiment of the invention, in a first position;

FIG. 9 shows a connector part incorporating aspects of an embodiment of the invention, in a second position;

FIG. 10 shows another connector part incorporating aspects of an embodiment of the invention, in a second position;

FIG. 11 shows a further connector part incorporating aspects of an embodiment of the invention, in a second position; and

FIGS. 12 and 13 show further connectors according to embodiments.

Referring now to the drawings, a nozzle part is shown at 10. Wherever nozzle parts are shown in the drawings, it will be appreciated that the nozzle part may be a complete nozzle, a portion of a larger nozzle part, or one component of a kit of parts which are joined together to make a complete nozzle.

Nozzle part 10 has an inlet 12, and an outlet 16, and fluid communication between the inlet 12 and outlet 16 is afforded by a passageway 20, which is defined by wall 28. The passageway 20 has a cross sectional area at a region 14 towards its inlet 12 larger than its cross sectional area towards its outlet 16.

A portion 18 of wall 28 adjacent the inlet 12 is shaped to enable its connection to other parts. For example, it may have a screw thread formation on the inner or outer face of the wall, or formations which form part of a bayonet fitting, or may be shaped for another mode of engagement with another part. In the example shown, the wall is shaped to form a part-spherical socket, to receive a hollow frusto-spherical ball-shaped element, to enable the nozzle part 10 to be pivoted about this element.

The nozzle part 10 is provided with indicators 22 and 24, which in the example shown in FIG. 1 are in the form of markings visible from the outside of wall 28. These may be in the form of markings which are raised from the surrounding wall, markings which are flush with the surrounding wall, or markings which are indented relative to the surrounding wall, and the indicators may extend around all, or part of, the wall 28. The indicators 22 and 24 may be used to mark areas which could be of significance to the user.

For example, they may be used to denote a certain distance from the outlet 16 of the nozzle part 10, which may be useful for helping the user position the nozzle, such as when assessing nozzle depth when inserting the nozzle into a hole. The indicators may also be used to denote a certain cross sectional area at the point marked. This would be useful to a user who wants to modify the nozzle 10, so that there is a larger cross sectional area at the outlet 16 than originally supplied. This allows a single nozzle to adapt for use in a number of different scenarios; a nozzle part 10 with a 2 mm diameter outlet could be adapted to have a 4 mm diameter for example, and/or a 6 mm diameter. This would allow the user to keep one type of nozzle in their tool box, and adapt it for different purposes. For example, the user may cut the nozzle part 10 using a tool such as a chisel, saw, a knife, a pair of pliers, or a pair of scissors, and the nozzle 10 may be made of a material which can be cut easily, such as a suitable plastics material.

The indicators may extend around the perimeter of the wall 28, and may extend in a direction perpendicular to a longitudinal axis defined by the passageway 20.

Another similar nozzle part is shown at 30, and the nozzle part 30 is provided with indicators 32 and 34. In this case the indicators 32 and 34 are formed as grooves in the wall 28, and these may extend around all of or part of the wall 28. It will be appreciated that the cross-sectional area at C is greater than that at the outlet 16, but less than that at B. The grooves may be shaped to engage a blade, such that they hinder or prevent movement of the blade once the blade has been inserted into the groove, to assist the user in cutting the nozzle part cleanly. Alternatively, or in addition, the grooves may create a thinner wall 28, which makes it easier for the wall to be broken at that point.

The grooves may be provided with several other features, as well as, or instead of, the features listed above. The grooves may be provided with a sharp corner to act as a stress-raiser, which would make it easier for the user to break that section of wall. The grooves may not be identical, and may be adapted to result in a stronger or weaker wall relative to the next groove. For example, by providing a deeper groove without thickening the wall at that point, the wall would be thinner and more fragile than the wall at a shallower groove. This technique could be used to provide grooves which are progressively more difficult to break off, and this could be used to assist the user when modifying the nozzle to give a different outlet size. For example, the sections could be progressively more difficult to break off as the cross sectional area of the passageway increases in size, meaning that the user breaks off pieces one by one using an increasing amount of force. This can be used to minimise the risk of breaking off the nozzle at an undesired groove, resulting in an outlet with a cross sectional area larger than the cross sectional area desired.

FIG. 4 shows another nozzle part 40, based upon similar principles to those discussed above. In this case, indicators in the form of grooves 42 and 44 are provided on the inner face of the wall 28, such that they would not be easily visible in use. However, as discussed above, the grooves may require progressively more force as the cross sectional area of the nozzle is larger, so if the user applies force to remove a section of wall to increase the outlet size, it is likely that the next standard size of outlet will be selected. Should the user wish to make the outlet size larger still, they can apply force to the nozzle again, until the next larger size breaks away.

FIG. 5 shows a nozzle part 50, which has indicators in the form of steps defining corners 52 and 54. The corners can provide a clear visual indicator of a certain point of the wall, and also act as a stress-raiser, which increases the likelihood of the wall breaking at that point when a force is applied. The wall 28 may taper between the indicators 52 and 54, but the nozzle part 50 could alternatively be made with walls which do not taper between the indicators, such that the cross sectional area of the passageway towards the outlet changes in steps. The wall 28 may have a reduced thickness at the corners 52 and 54.

FIG. 6 shows a nozzle part 60, which has indicators in the form of portions of relative weakness in the wall at 62 and 64. These may be made of a different material from the remainder of the nozzle 60, or may be the same material which has been weakened, such as by heat treatment, UV light treatment, or by the material having a different structure at those points.

It will be understood that any of the indicator features discussed above may be combined. For example, a nozzle part could be provided with a groove on the outer surface of its wall and on the inner surface of its wall, and the remaining wall at the base of each groove could also be weakened. Similarly, there could be one indicator of one type for one groove, and a different type of indicator for the next groove. One such combination is shown in FIG. 7, which shows a nozzle part 70 with a groove in the outer surface of wall 28 at 72 a, and an area of weakness 72 b in the wall under the groove. There is a further groove in the outer surface of the wall at 74 a, and a groove on the inner surface of the wall at 74 b.

Referring now to FIG. 8, a cutaway view of a connector 100 for connecting to a first fluid container 110 a is shown, in a first position. Such a connector 100 may be used as a base part for a nozzle, and may be suitable for conveying a viscous liquid. The connector comprises a first connector portion 120, and a second connector portion 140.

The first connector portion 120 has a wall 132, and a flange portion 126. The flange portion may have an abutment face 122. An inner surface 136 of the wall 132 defines an axial passageway 138, and part of the inner surface of the wall is provided with an engagement formation 130. Although the engagement formation 130 shown in the drawings is a screw thread, any suitable engagement formation may be used, for example one for bayonet engagement, or a smooth or tapered inner wall which allows a transition or interference fit to be achieved.

The wall 132 extends to an outlet formation 134. The outlet formation may be shaped to function as a nozzle, or may be shaped to engage another part. For example, the outlet formation may provided with a hollow frusto-spherical ball-shaped element, for engagement with a part-spherical socket of a further part, which may enable the further part to be pivoted about this element.

The outer surface 124 of the flange portion 126 is provided with an engagement formation comprising a screw thread. The upper surface 128 of the flange formation 126 may be provided with a sealing means, such as a deformable seal.

The second connector portion 140 is substantially annular, and has a wall 150 with a flange portion 144. The flange portion 144 has an abutment face 142, which may abut the fluid container 110, in use. On the inner surface 148 of the wall 150, there is an engagement formation 146 in the form of a screw thread engaged by the screw thread on the outer surface of flange portion 126, and wall 150 extends to a shoulder portion 152. The engagement formation may extend to cover all or part of the inner surface 148 of the wall 150. The shoulder portion 152 has an inner surface 154, and this may be provided with a sealing means, such as a deformable seal.

When the connector 100 is in the first position, the first fluid container 110 a can be engaged by the engagement formation 130, and the contents of the fluid container can then flow into the axial passageway 138.

Referring now to FIG. 9, the same connector 100 is shown, in a second position, connected to a second fluid container 110 b. The first connector portion 120 has been moved axially relative to the second connector portion 140. To move the connector 100 from the first position to the second position, the first connector portion 120 may be moved along the engagement formation, such as by rotating the first connector portion relative to the second connector portion where the engagement formation 146 is compatible with an engagement formation provided on the outer surface 124 of the flange portion 126. Alternatively, where there is not a compatible engagement formation provided on the outer surface 124, the first connector portion 120 may simply be moved manually, or moved by the ingress of the container 110 b into the first connection portion 140.

In the arrangement shown in FIG. 9, the upper surface 128 of flange 126 is in contact with the inner surface 154 of shoulder portion 152. These portions may be retained in close liquid tight contact with one another, and the deformable seals which may be present on one or each of these may be deformed to achieve this. The movement of the second connector portion allows space for the second fluid container 110 b to be engaged by the engagement formation 146. In the second position, viscous liquid from the second container 110 b may be permitted to flow into the passageway 138.

It will be appreciated that modifications may be performed to the above described arrangement without departing from the scope of the invention. For example, the outer wall surface 124 of the flange portion 126 may seal to the inner wall 146 of the first connector portion 140, so the upper surface 128 of the flange 128 does not have to be in contact with the inner surface 154 of the shoulder portion 152 to be used in the second position. Similarly, additional connector parts could be provided which would allow a greater number of container outlets to be engaged. For example, another connector portion may be provided around the outer surface of connector portion 140, such that the connector portion 140 is in the same relationship with the new connector portion as the second connector portion 120 is with the first connector portion 140 in the drawings.

An example of another connector incorporating aspects of an embodiment of the invention is shown in FIG. 10. The second connector portion of the connector 200 is connected to second fluid container 110 b, and the first connector portion 250 is elongated to provide a nozzle formation, which is provided with indicators in accordance with aspects of embodiments of the invention. This demonstrates one possible combination of the features described above, but it will be appreciated that any compatible features described above may be combined without departing from the scope of the invention.

Extender parts may also be used with the nozzle part and connector described herein. An extender part may comprise one engagement formation disposed at an inlet end, another engagement formation at an opposite end, and a wall defining a passageway therebetween. The engagement formation at the outlet end of an extender part may be adapted to engage with the engagement formation at the inlet end of an extender part, enabling several extender parts to be connected to one another.

For example, the engagement formation at the inlet end may be a part-spherical socket element, and the engagement formation at the outlet may be hollow frusto-spherical ball-shaped element. This would enable a number of extender parts to be connected consecutively, and each extender part to be pivoted about the hollow frusto-spherical ball-shaped element received at or adjacent its inlet.

The part spherical socket element at the inlet of an extender part may be engaged with a frusto-spherical ball-shaped element provided at or adjacent the outlet of first connector portion 120 of the connector part 100. Similarly, the hollow frusto-spherical ball-shaped element provided at the outlet of the extender part may be engaged with a part-spherical socket provided at the inlet of a nozzle part. Using this principle, a number of extender parts may be used to provide the required nozzle assembly length, and the parts may be pivoted to achieve the desired nozzle outlet position. A number of the parts described may be provided in a kit, to allow the user to achieve a number of different nozzle assemblies.

An example of another connector incorporating aspects of an embodiment of the invention is shown in FIG. 11. The second connector portion of the connector 300 is connected to second fluid container 110 b, and the first connector portion has an engagement formation 310 at the outlet in the form of hollow frusto-spherical ball-shaped element. A nozzle portion generally indicated at 320 is provided with a part-spherical socket which is engaged with the engagement formation 310. An extender part 400 is also shown, which includes an engagement formation 410 at the outlet in the form of hollow frusto-spherical ball-shaped element, and a part-spherical socket 418. It will be appreciated that the part-spherical socket 418 could be engaged with the engagement formation 310, or an engagement formation 410 of another extender part 400. The user could therefore connect one extender part 400 to a connector 300, connect any further number of extender parts 400 to that extender part, before fitting a nozzle part 320 to the remaining available engagement formation 410 of the endmost extender part. Using this method, a number of different assemblies could be achieved by using different numbers of extender parts. As each part-spherical socket can pivot about each hollow frusto-spherical ball-shaped element, an assembly with a number of extender parts can be pivoted at each joint, enabling a number of different configurations of nozzle to be achieved.

FIGS. 12 and 13 show other embodiments of the present invention and, in particular, a connector 500. In relation to these embodiments, the first fluid container 110 a (configured to contain a viscous liquid generally as herein described) may be provided to which is fitted a delivery nozzle 501.

The delivery nozzle 501 may, in some embodiments, be integrally formed with the first fluid container 110 a (for example, the delivery nozzle 501 may be integrally formed with at least one part of the first fluid container 110 a). The delivery nozzle 501 is configured to receive a viscous liquid from the first fluid container 110 a and to provide a passageway for that viscous liquid from the first fluid container 110 a to an aperture 502 defined in a distal end of the delivery nozzle 501 (a proximal end of the delivery nozzle 501 being adjacent the first fluid container 110 a).

The delivery nozzle 501 may be formed of the same material (e.g. plastic) as at least part of the first fluid container 110 a (e.g. a part of the first fluid container 110 a which is adjacent the delivery nozzle 501). The delivery nozzle 501 may be permanently secured to the first fluid container 110 a (such that removal of the delivery nozzle 501 from the first fluid container 110 a would damage one or both of the delivery nozzle 501 and first fluid container 110 a).

The delivery nozzle 501, as will be appreciated, is hollow such that the aforementioned passageway is provided for the viscous liquid. The delivery nozzle 501 may, therefore, be generally a hollow frusto-conical or conical shape—with a widest part at the proximal end and the narrowest part at the distal end of the delivery nozzle 501.

The connector 500 of this embodiment is configured for a push-fit to the delivery nozzle 501 such that the connector 500 is configured to receive the viscous liquid which is dispensed through the aperture 502 from the delivery nozzle 500.

The connector 500 comprises a body 510. The body 510 is hollow such that a passageway is defined by the body 510 through which the viscous liquid dispensed from the delivery nozzle 500 may be passed (e.g. from the connector 500 on to a nozzle part or extender part such as described herein). The passageway defined by the body 510 may be configured to receive at least part of the distal end of the delivery nozzle 501.

The body 510 includes an outer shell 511 and an inner sleeve 512. The outer shell 511 is constructed from a relatively rigid material and the inner sleeve 512 is constructed from a relatively soft or deformable material. The inner sleeve 512 is fitted within the outer shell 511 and may be secured thereto by an interference fit and/or the use of an adhesive and/or some other arrangement.

The outer shell 511 is a generally hollow, tube-like, member which is configured to receive the inner sleeve 512 which is also a generally hollow, tube-like, member. The inner sleeve 512, therefore, forms an inner liner for the outer shell 511 of the body 510.

More particularly, in some embodiments, with the inner sleeve 512 received by the outer shell 511, an inner surface of the outer shell 511 engages an outer surface of the inner sleeve 512. An inner surface of the inner sleeve 512 then defines the passageway for the flow of viscous liquid therethrough and/or the receipt of at least part of the distal end of the delivery nozzle 501.

The inner sleeve 512 may be tapered such that it is widest towards a proximal end of the body 510 and narrowest towards a distal end of the body 510. Accordingly, the passageway defined by the inner sleeve 511 may be correspondingly tapered—as may be the inner surface of the outer shell 510 in some embodiments.

The inner sleeve 512 may extend through the entire of or a part of a length of the outer shell 511. In embodiments, the inner sleeve 512 is generally located towards a proximal end of the outer shell 511. In embodiments, a distal end of the outer shell 511 may be secured to or otherwise provided with a nozzle part, or an extender part such as described herein. Accordingly, a distal end of the body 510 (which may also be distal end of the outer shell 511) may be in the form of a hollow frusto-spherical ball shaped element—generally as described herein for receipt by a corresponding element of another part (see FIG. 13).

Thus, the connector 500 may be fitted to the delivery nozzle 501 by receiving part of the distal end of the delivery nozzle 501 within the passageway defined by the inner sleeve 512. The body 510, the outer shell 511, and inner sleeve 512 are configured such that, when the end of the delivery nozzle 501 is so received, an outer wall of the delivery nozzle 501 presses against (i.e. abuts) the inner sleeve 512 (e.g. the inner wall of the inner sleeve 512). The inner sleeve 512 may be configured to deform resiliently as a result and the resilient deformation may be such that this holds the connector 500 in place on the delivery nozzle 501. In particular, the outer shell 511 may provide support for the inner sleeve 512 such that there is no or little deformation of the outer shell 511 when the inner sleeve 512 is so deformed. Accordingly, the inner sleeve 512, once deformed, acts on the delivery nozzle 501 to hold it in place within the passageway.

The body 510 (the inner sleeve 512 and the outer shell 511) may be configured such that, with connector 500 secured to the delivery nozzle 501, the aperture 502 defined in the distal end of the delivery nozzle 501 is located outside of the confines of the inner sleeve 512 such that viscous liquid delivered through the delivery nozzle 501 will be delivered above (i.e. beyond) the inner sleeve 512. This reduces the fluid pressure on the coupling between the connector 500 and the delivery nozzle 501 and reduces the risk of the fluid pressure causing disengagement thereof in normal use

As will be appreciated, the nozzle part of embodiments described herein may be constructed from a relatively rigid material such that the nozzle part is not easily manually deformable.

It will be appreciated that the provision of a weakening and/or other indicator on a nozzle part, generally as herein described, is a significant advancement—particularly in relation to a nozzle assembly which is flexible (e.g. including one or more extender parts, for example) where such arrangements were not previously thought feasible.

When used in this specification and claims, the terms “comprises” and “comprising” and variations thereof mean that the specified features, steps or integers are included. The terms are not to be interpreted to exclude the presence of other features, steps or components.

The features disclosed in the foregoing description, or the following claims, or the accompanying drawings, expressed in their specific forms or in terms of a means for performing the disclosed function, or a method or process for attaining the disclosed result, as appropriate, may, separately, or in any combination of such features, be utilised for realising the invention in diverse forms thereof. 

1. A nozzle part for conveying a viscous fluid, comprising: at least one wall defining a passageway, the passageway having an outlet remote from an inlet, the passageway having a larger cross sectional area at or adjacent its inlet compared to a lower cross sectional area at or adjacent its outlet, wherein at least a part of the wall is provided with at least one indicator to differentiate a part of the wall from the remainder of the wall.
 2. The nozzle part according to claim 1, wherein the indicator comprises at least one of: a marking on a surface of the wall; a recess or groove in the wall; or an area of weakness in the wall.
 3. The nozzle part according to claim 1, wherein the indicator extends in a direction perpendicular to a longitudinal axis of the passageway.
 4. The nozzle part according to claim 1, wherein the indicator extends around the perimeter of the wall.
 5. The nozzle part according to claim 1, wherein the indicator is provided on an outer surface of the wall.
 6. The nozzle part according to claim 1, wherein the indicator is provided on an inner surface of the wall.
 7. The nozzle part according to claim 2, wherein the at least one indicator is a plurality of indicators disposed in order of weakness relative to the outlet.
 8. The nozzle part according to claim 7, wherein the at least one indicator is a plurality of indicators which are progressively resistant to breakage in a direction away from the outlet.
 9. The nozzle part according to claim 1, wherein the indicator is in the form of a step defining a corner.
 10. The nozzle part according to claim 1, wherein the indicator is in the form of an area of reduced wall thickness.
 11. The nozzle part according to claim 1, wherein the nozzle is provided with a socket formation at or adjacent its inlet.
 12. The nozzle part according to claim 11, wherein the socket formation is part-spherical.
 13. A connector for engagement with a delivery nozzle of a storage tube, the connector comprising: a hollow outer shell; and a resiliently deformable inner sleeve fitted within the outer shell, wherein the resiliently deformable inner sleeve is configured to receive at least part of the delivery nozzle of the storage tube such that the resiliently deformable inner sleeve at least partially deforms to hold the delivery nozzle in engagement with the connector.
 14. The connector according to claim 13, wherein the hollow outer shell defines a passageway in which the resiliently deformable inner sleeve is received.
 15. The connector according to claim 14, wherein the connector is configured such that an end of the delivery nozzle including an aperture is located beyond the confines of the resiliently deformable inner sleeve when the delivery nozzle is at least partially received by the resiliently deformable inner sleeve
 16. The connector according to claim 13, wherein the resiliently deformable inner sleeve is supported by the hollow outer shell.
 17. The connector according to claim 13, wherein the connector defines a passageway for the flow of a viscous liquid from the delivery nozzle.
 18. A nozzle assembly comprising a nozzle part coupled to a connector for conveying a viscous fluid, the nozzle part comprising: at least one wall defining a passageway, the passageway having an outlet remote from an inlet, the passageway having a larger cross sectional area at or adjacent its inlet compared to a lower cross sectional area at or adjacent its outlet, wherein at least a part of the wall is provided with at least one indicator to differentiate a part of the wall from the remainder of the wall; and the connector being for engagement with a delivery nozzle of a storage tube, the connector comprising: a hollow outer shell; and a resiliently deformable inner sleeve fitted within the outer shell, wherein the resiliently deformable inner sleeve is configured to receive at least part of the delivery nozzle of the storage tube such that the resiliently deformable inner sleeve at least partially deforms to hold the delivery nozzle in engagement with the connector.
 19. The nozzle assembly according to claim 18 further comprising an extender part configured to couple the nozzle part to the connector. 